In this March 2, 2019, file photo, Kim Yo Jong, sister of North Korea's leader Kim Jong Un attends a wreath-laying ceremony at Ho Chi Minh Mausoleum in Hanoi, Vietnam. Credit: Jorge Silva / AP

SEOUL, South Korea — The powerful sister of North Korea’s leader has criticized South Korean President Moon Jae-in and threatened a “complete destruction” of relations hours after Moon said South Korea’s growing missile capabilities will serve as a “sure deterrence” against North Korean provocations.

Moon made the comments after South Korea’s first successful test of a submarine-launched ballistic missile. The test came hours after the South Korean and Japanese militaries said North Korea had fired two ballistic missiles into the sea.

In a statement released by state media on Wednesday, North Korean leader Kim Jong Un’s sister, Kim Yo Jong, criticized Moon’s description of the North Korean missile tests as a provocation, and warned of a “complete destruction” of bilateral relations if Moon continues with what she described as slander of North Korea.

Story by Hyung-jin Kim and Kim Tong-hyung. Associated Press writer Mari Yamaguchi contributed to this report.